Adjustable shore



March 1 I 927 H. H. LAMPERT ADJUSTABLE SHORE Filed July 1, 1924 Patented Mar. 22, 1927.

UNITED STATES HENRY H. LAMPERT, OF CHICAGO, ILLINOIS.

ADJUSTABLE $I-IORE.

Application filed July 1, 1924. Serial No. 723,544.

The main object of this invention is to provide an improved adjustable shore of light construction, with maximum strength; to provide a shore with a self-bracing head, carrying a head timber to which forms can conveniently be nailed; to provide an adjustable shore in which shore timbers can be used without nailing or cutting and hence be available for repeated use; to provide a shore with a base supporting shelf, which will in action automatically clamp the timber base and act as a b ace to the section holding the shelf; to provide a head section and a foot section of economical construction for quantity production so that they are interchangeable in construction work.

An illustrative embociment of this invention is shown in the accompanying drawing, in which Figure 1 is a. complete shore supporting a temporary form.

Figure 2 is a section at line 2 using four angle irons.

Figure 3 is a section at line 2 using two channel irons.

Figure 4 is a section at line 2 using two angle irons.

Figure 1 is a complete improved shore, comprising a shore timber 1, seated upon a shelf 2, which is supported in angular spaced notches 3 cut in the supporting angle irons t, which form a part of the rectangular frame of the foot or jack section. The angle irons 4 are secured to a casting o', which has a threaded aperture 6 to receive a screw 7, which has swivel connection with a foot plate 8. The upper end of the jack section is a rectangular frame, which is held spaced by a riveted collar 9. Coacting with the upper end of the shore timber is a head section comprising a rectangle of similar angle irons l, to which are secured right angle angle bars 10, having ends supported by braces 11. The braces 11 project above the angle iron 10 and are provided with nail holes 12 for the purpose of securing a head timber 13. In Figure 1, an illustrative sketch of a temporary form is shown resting upon and nailed to the head timber. This temporary form comprises strips 14: which are nailed to the head timber, with upright supports 15 and braces 16.

One of the improved features of this invention is the form and action of the shelf 2. The shelf provides a quick setting of the shore timber by slipping it in place and following it up "with the shelf 2. This makes it possible touse standard length shores from stock without cutting. The di rect load upon the shore is carried by the self 2. The base of the shelf has angular bearing surfaces which coact with the angu lar notches 3, with clearance between the edges of the shelf and the bottom of the notch, so that when the load is applied through a stress on the shore timber the shelf bearings are forced into the notches, drawing the corner angle irons st in closer contact with the timber. At the same time the action tends to stiffen the rectangular frame of the jack at its weakest point, and at the place of greatest stress.

A cross section of the jack section 1, at the position of the shelf, is shown in Figure 2, in which the shelf coacts with the four angle irons, drawing them together. An

equivalent arrangement is shown in Figure 3, in which the shelf rests upon angular notches cut in two channel irons. This construction gives an increased pinching action, but this increase is obtained by a sac riiice in the light construction. An equivalent result is shown in Fig. l, in which the shelf 2 rests in a frame made of two angle irons which are drawn up to the shore timber and braced by the action of the shelf 2.

Although but one specific embodiment of this invention has been heroin shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined by the following claim.

I claim:

In. combination in an adjustable shore opposed strut members having inumrdly ex tending flanges and downwardly sloping notches in said flanges, a. second strut member slidable between said strut members, and a shelf having angularly inclined edges adapted to be engaged in opposite notches in said flanges to supportthe slidable member and thereby draw the opposed strut members inwardly to grip said slidable member.

Signed at Chicago, this 28th day of April,

HENRY H. LAMPERT. 

